Kids are born curious about the world. What adults primarily do in the presence of kids is unwittingly thwart the curiosity of children.

We're quite happy with our Big Bang description of cosmic origins. But actually, the Big Bang accounts for what happened only after the beginning. The beginning itself, and especially what happened before, remains the biggest mystery of all.

Grab something off the shelf that's on the spaceship-an ashtray, it doesn't matter what. Because I can tell you, if they flew here from another galaxy, no matter what you've pulled off the shelf, it'll be unlike anything we have on Earth.

It's part of our pop culture to give animals human personalities and talents.

I dream of a world where the truth is what shapes people's politics, rather than politics shaping what people think is true.

If you're a scientist, and you have to have an answer, even in the absence of data, you're not going to be a good scientist.

You can make a stack high enough to reach the moon and back, and only then will you have used your 100 billion hamburgers. This is terrifying news to cows.